National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

A Few Clouds

82°F

28°C

Humidity 40%
Wind Speed Vrbl 3 mph
Barometer 30.03 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 19 Jun 2:50 pm CDT
Extended Forecast for

Dorchester IL

  • Tonight

    Tonight: Isolated showers after 3am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.

    Low: 62 °F

    Mostly Cloudy
    then Isolated
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 83. Light and variable wind.

    High: 83 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 64. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 40%.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 7am, then showers and thunderstorms after 7am. High near 78. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    High: 78 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 9 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 63 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.

    High: 75 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Isolated showers after 3am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.
Saturday
Mostly sunny, with a high near 83. Light and variable wind.
Saturday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 64. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 40%.
Sunday
Showers and possibly a thunderstorm before 7am, then showers and thunderstorms after 7am. High near 78. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 9 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 59.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 59.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dorchester IL
 39.1°N 89.87°W (Elev. 659 ft)
Last Update:
2:31 pm CDT Jun 19, 2026
Forecast Valid:
3pm CDT Jun 19, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation